First of all, if all you want is our actual policy then
you can find it in this question:
Proposed policy on mathematical questions
The policy described there is, briefly:
A question is off-topic on Puzzling if it is routine.
This means that the question can be answered by following a standard procedure.
Other related considerations: is the ...
You are not required to use the ™ symbol, and there is no actual trademarking going on (as far as I'm aware). As bobble mentions in a comment:
I always read the TM symbol as a bit tongue-in-cheek. "These words are so important that they merit a trademark!". As another example, this puzzle uses no less than three TM symbols in a row, both to meet ...
Our aim here, when posting puzzles, is not to collect every puzzle and riddle into one place. It is more about sharing either original puzzles, or ones that are very interesting that most people probably wouldn't have seen, with a community of puzzle fans. Attempting to collect every puzzle here is an impossible task, and not one we want done anyway.